Tag: human eye and its working

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Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

The eye consists of a screen called ______, on which the light rays are focused.

  1. Retina

  2. Iris

  3. Pupil

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The eye consists of a screen called retina which generates the sensation of sight. When light rays are focussed on it, an image is formed on the retina. The retina consists of light sensing cells which send signals to the brain, whenever such images are formed.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

Two pont white are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye ? [Take wavelength of light = 500 nm]

  1. 5 m

  2. 1 m

  3. 6 m

  4. 3 m
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using Rayleigh's criterion, the angular resolution is theta = 1.22 * lambda / D. With lambda = 500 nm and D = 3 mm, theta = 1.22 * 500e-9 / 0.003 = 2.03e-4 radians. For a separation of 1 mm (0.001 m), the distance L = 0.001 / 2.03e-4, which is approximately 4.92 meters, rounding to 5 meters.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

If you read the words of your book, the reflection is

  1. specular reflection

  2. diffused reflection

  3. may be specular may be diffused

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Reading words from a book involves light reflecting off the surface in many directions so that it can be seen from various angles. This scattering of light is known as diffused reflection.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

Image formation takes place by

  1. specular reflection

  2. diffused reflection

  3. Both (a) and (b)

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Image formation, such as in a mirror or through a lens, relies on the regular, predictable reflection or refraction of light rays. This is characteristic of specular reflection.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

The distance of the eye-lens from the retina is $x$. For a normal eye, the maximum focal length of the eye-lens

  1. $= x$
  2. $< x$
  3. $> x$
  4. $= 2x$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Focal length of normal eye lens is equal to the distance between eye-lens and retina i.e, $x$  so that all rays converges on retina after passing through  eye-lens

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

The persistence of vision for normal human eye is :

  1. $1/{ 10 }^{ th }$ of a second
  2. $1/{ 16 }^{ th }$ of second
  3. $1/{ 6 }^{ th }$ of a second

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The persistence of vision is the phenomenon where an image remains on the retina for a fraction of a second after the stimulus is removed, typically cited as 1/16th of a second.

Multiple choice physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

Refraction of light in the eye occurs at ............

  1. The lens only

  2. Cornea only

  3. both cornea and lens

  4. The Pupil
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Refraction of light in the human eye occurs primarily at the cornea, which provides most of the eye's refractive power, and is further adjusted by the crystalline lens.